深入探索ArkWeb：构建高效且安全的Web组件 原创 精华

@Entry
@Component
struct AdvancedWebView {
  // 组件状态
  @State private src: string = '';
  @State private isLoading: boolean = true;
  @State private error: string | null = null;
  // 构建方法
  build() {
    Column() {
      if (this.isLoading) {
        // 加载中状态
        Progress().width('100%').height('5vp');
      } else if (this.error) {
        // 错误状态
        Text(this.error).fontSize(18).color('#FF0000');
      } else {
        // 正常显示WebView
        Web({ src: this.src })
          .width('100%')
          .height('100%')
          .onLoad(() => {
            this.isLoading = false;
          })
          .onError((err) => {
            this.error = err.message;
            this.isLoading = false;
          });
      }
    }
  }
  // 设置URL方法
  setSrc(newSrc: string) {
    this.src = newSrc;
    this.isLoading = true;
    this.error = null;
  }
}
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class SecurityManager {
  // 强制HTTPS
  static enforceHttps(url: string): string {
    return url.startsWith('https://') ? url : `https://${url}`;
  }
  // 设置CORS策略
  static setCorsPolicy(webview: Web, policy: CorsPolicy) {
    // 应用CORS策略
    webview.setCorsPolicy(policy);
  }
  // 设置CSP
  static setContentSecurityPolicy(webview: Web, policy: string) {
    // 应用CSP
    webview.setContentSecurityPolicy(policy);
  }
}
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class PerformanceOptimizer {
  // 预加载资源
  static preloadResources(resources: string[]) {
    resources.forEach((resource) => {
      // 预加载逻辑
      const request = new XMLHttpRequest();
      request.open('GET', resource, true);
      request.send();
    });
  }
  // 懒加载机制
  static enableLazyLoading(webview: Web) {
    // 启用懒加载
    webview.setRenderMode(RenderMode.LAZY);
  }
}
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class InteractionHandler {
  // 发送消息到WebView
  static postMessage(webview: Web, message: any) {
    webview.postMessage(message);
  }
  // 监听来自WebView的消息
  static onMessage(webview: Web, callback: (message: any) => void) {
    webview.onMessage = callback;
  }
}
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// 示例：在应用中使用AdvancedWebView
const advancedWebView = new AdvancedWebView();
advancedWebView.setSrc(SecurityManager.enforceHttps('https://www.example.com'));
SecurityManager.setCorsPolicy(advancedWebView, { /* CORS策略配置 */ });
SecurityManager.setContentSecurityPolicy(advancedWebView, "default-src 'self'; script-src 'self' 'unsafe-inline'; object-src 'none';");
PerformanceOptimizer.preloadResources(['https://www.example.com/styles.css', 'https://www.example.com/scripts.js']);
PerformanceOptimizer.enableLazyLoading(advancedWebView);
InteractionHandler.onMessage(advancedWebView, (message) => {
  // 处理从WebView接收的消息
  console.log('Received message from WebView:', message);
});
// 将WebView添加到页面
advancedWebView.appendTo(document.body);
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